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POUsing alex/happy with Cabal
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copied!<p>I'm writing a compiler for a class I'm taking. The class isn't specifically Haskell but I'm using Haskell to write my compiler and interpreter. I have a cabal package setup to hopefully make it easy for my prof to run/compile. I have happy and alex in the build-tools field for both executables but Cabal ignores that and then complains that it cannot find the modules that Happy and Alex should be generating. If I manually run: </p> <pre><code>alex LimpScanner.x happy LimpParser.y </code></pre> <p>then cabal runs perfectly.</p> <p>I thought I had cabal automatically running them earlier but perhaps I remember imperfectly.</p> <p>limp.cabal:</p> <pre><code>-- limp.cabal auto-generated by cabal init. For additional options, -- see -- http://www.haskell.org/cabal/release/cabal-latest/doc/users-guide/authors.html#pkg-descr. -- The name of the package. Name: limp -- The package version. See the Haskell package versioning policy -- (http://www.haskell.org/haskellwiki/Package_versioning_policy) for -- standards guiding when and how versions should be incremented. Version: 0.1 -- A short (one-line) description of the package. Synopsis: LIMP Compiler (Compiler Construction course project) -- A longer description of the package. -- Description: -- URL for the project homepage or repository. Homepage: http://www.cs.rit.edu/~eca7215/limp/ -- The license under which the package is released. License: AllRightsReserved -- The file containing the license text. License-file: LICENSE -- The package author(s). Author: Edward Amsden -- An email address to which users can send suggestions, bug reports, -- and patches. Maintainer: eca7215@cs.rit.edu -- A copyright notice. -- Copyright: Category: Language Build-type: Simple -- Extra files to be distributed with the package, such as examples or -- a README. -- Extra-source-files: -- Constraint on the version of Cabal needed to build this package. Cabal-version: >=1.2 Executable limp -- .hs or .lhs file containing the Main module. Main-is: Limp.hs hs-source-dirs: src -- Packages needed in order to build this package. Build-depends: base, array, haskell98 -- Modules not exported by this package. -- Other-modules: -- Extra tools (e.g. alex, hsc2hs, ...) needed to build the source. Build-tools: alex, happy Executable limpi Main-is: LimpInterpreter.hs hs-source-dirs: src Build-depends: base, array, haskell98 Build-tools: alex, happy </code></pre> <p>Directory layout: </p> <pre><code>limp/ ├── Setup.hs ├── limp.cabal └── src/ ├── Limp.hs ├── LimpInterpreter.hs ├── LimpParser.ly ├── LimpScanner.x └── LimpToken.hs </code></pre>

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